“Hardcore chocolatiers are taking a cue from third-wave coffee geeks to create some of the country’s most complex hot chocolate. The result? A few remarkable mugs that prove single-origin is the best thing to happen to hot chocolate since marshmallows. Here are three chocolatiers experimenting with our favorite new advancements in drinkable chocolate, plus a few other cafés and restaurants around the country where you can find cocoa with custom flair.”